function random_tout() {

  var ran_number_2=Math.floor(Math.random()*3);
  
  var second_tout = document.getElementById('tout'+ran_number_2);
  second_tout.className += " visible_right";
  pngFix();
  }
  
  function pngFix() {
    var browser=navigator.appName;
    var b_version=navigator.appVersion;
    var version=parseFloat(b_version);
    
    if(browser == "Microsoft Internet Explorer" && version <=6){
      var img = document.getElementById("logo");
      img.innerHTML =" ";
      img.className ="logoPng";
      }
  }
  

window.onload = random_tout;